Malicious PDF — malware analysis report

Static analysis result for SHA-256 633e5224502b534c…

MALICIOUS

PDF

86.8 KB Created: 2021-08-26 13:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 149970f2ecf19c59f0f901782513eb58 SHA-1: c128cc1cd3825bccd23ccdc9ae8a0d22d8fc7d78 SHA-256: 633e5224502b534c3ee9a531670fc1c13b340104d7fa3c0dcd3e9c1138ed6123
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to WordPress installations that appear to be compromised, serving as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/37f0825ae279fde2af1a813a8c205048/gawowomarameka.pdf In PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/eef7dbf14ad9e6f0639be59ebbbeaed9/leretasiwop.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/24343130835.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/977b040b1e90e62b431277fcf62ca60e/53963250178.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/96318208237.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/kumuxuwumadiwime.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/16652822527.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/fda788bbb48f341acec1b25d3093e195/38749589205.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/peviju.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xotitonozepofikomi.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/64435636319.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/nipopekizudiruvarovadu.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/zenomufubinile.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/mokiperow.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/l7r2cijgcko8khc7uabh1oqno0/57597185761.pdfIn PDF document text
    • http://elanaclub.ru/userfiles/file/fopabozijodudivoj.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/6b66a70d7c4d292a3bca8655c307e1e5/3895149025.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a9086db7e51---vogefakizesezozo.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74173737731.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/584254ebf29e0be23f8b5bf797c63014/rezafegazuwasugetojilesa.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111ae0518632---63031977661.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/cockmrft7i79pdngnuhagpjn32/ravakalawo.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b36c75f9ed---zelowavax.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b2878c9d30eef975031a174f3443c0e1/xusuwogew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=recombinant+dna+in+agriculturePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EF 10828 bytes
SHA-256: f6add72b94a9c0d17246c1ccdd8a3bd2dcfad18380bf5662bb80b2ef11310a18
font_02_sfnt_off0001229e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229E 16624 bytes
SHA-256: 9c9da37a437948801cd0fa7eb56f3de70df29db4b0fee5e64eb1e0af51f1dfee

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